Activate app feature via CSOM

Hi, is it in any way possible to activate a custom feature, that is deployed via an app using CSOM in o365? There is no problem in deactivating it using CSOM. 

The feature is web scoped, i have tried all combinations of web/site and scopes

var features = ctx.Web.Features;
features.Context.Load(features);
features.Context.ExecuteQueryRetry();
features.Add(.., true, FeatureDefinitionScope.Farm);
features.Context.ExecuteQueryRetry();